MDI BASED LININGS AND MEMBRANES FROM PREPOLYMERS WITH VERY LOW FREE MONOMERIC ISOCYANATES
The present invention relates to a two part polyurethane and/or polyurethane polyurea hybrid based system for making an elastomeric material, comprising an Iso part having low free monomer and an amine/polyol part, wherein the Iso part comprises a pre-polymer of polyurethane, and wherein the pre-pol...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The present invention relates to a two part polyurethane and/or polyurethane polyurea hybrid based system for making an elastomeric material, comprising an Iso part having low free monomer and an amine/polyol part, wherein the Iso part comprises a pre-polymer of polyurethane, and wherein the pre-polymer is an MDI based pre-polymer with low free MDI monomer and capped with isocyanate groups from a second relatively higher vapor pressure isocyanate and the pre- polymer contains less than about 0.3% total free monomer and has an NCO% in the range of about 0.1 to about 10%. |
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